It's Garfield's birthday and Jon forgets. He later remembers, and makes 8 lasagnas but is one short. Meanwhile, an unusual type of Alien which looks like lasagna and can speak English with an Italian accent arrives on Earth. They plan to invade the Earth, but are quickly scared away by Garfield's ravenous appetite.

A Bluebird gets trapped in Garfield's neighbor's garage leaving her eggs abandoned, forcing Garfield to look after them. The eggs hatch, and call Garfield mother. This episode marks the first appearance of Garfield's rival Harry, who is determined to eat the chicks.

Garfield disguises himself as "Catzilla" for Halloween, but people mistake him for the real Catzilla, a deadly creature who escaped from the zoo.

Odie digs up some bones and finds that they are from the very rare Brachiosaurus. Garfield tries to sell them to the local museum, but the museum curator instead wants to compulsory purchase and demolish Jon's house to search for more dinosaur bones.

Jon tests a cleaning robot.

Garfield and Odie watch a movie about a villain named Silent Jack and mistakenly believe Jon, with recent tooth surgery, to be Silent Jack. In the end Garfield, Odie and Squeak find out they were attacking Jon, but the real Silent Jack robs them.

Nermal finds a cat called "Agent X" who claims to be a Secret Agent, but really a runaway cat. Garfield becomes jealous as Agent X tells everyone about his adventures, so Garfield tries to prove he is a house cat named "Fluffykins".

Squeak and his family move in to Jon's house while Jon and Odie are out. Garfield allows Squeak's family to remain in the house on the condition that they be his servants. Jon comes back and Garfield has to remove Squeak and his family before Jon called Rat-Tator Pest, who's hefty bill would have meant that Jon would not be able to afford lasagna for years.

Garfield gets an awful tasting Pizza from Mama Meany's Pizza Palace, Vito's rival. Mama Meany is putting Vito out of business through coupons, contests and discounts and plans to expand the restaurant to take over Vito's. Garfield arranges for Eddie Gourmand to compare Mama Meany pizza with Vito's, bringing the closure of Mama Meany, and resumed success of Vito.

Garfield searches for his teddy bear Pooky after he is stolen by a dog named Hercules.

Jon and Liz put Garfield on a diet and force him to exercise when an electronic talking scale tells him that he's overweight.

Jon has difficulty sleeping, so a Hypnotist attempts to put Jon under hypnosis to make him fall asleep at the sound of a horn. However, Jon hears Odie's bark before the horn, making Odie the hypnosis trigger.

Jon finds his old Accordion but Garfield doesn't like him playing it nor the very sound of it. Garfield tries to get rid of it, but in the end, the Accordion breaks and Jon gets bagpipes instead.

Jon wins a turkey in a competition, which he plans to cook for Liz. However, when it is delivered it is still alive. Garfield disguises himself as a turkey to get rid of the real one.

Odie gets taken to the dog pound as he's not wearing his license tag Collar. Garfield disguises himself as a dog to rescue Odie.

Jon and Garfield fight so much against what to watch on TV that they decide to go on a TV show called Pet Matchers.

Garfield gets rich after a Leprechaun gives him some good luck.

Odie becomes a monster-dog in the middle of the night and eats a lasagna that was for for Jon and Liz. Jon thinks that Garfield is responsible, and blames him.

Garfield goes to visit Jon's little brother Doc Boy. But with no TV and no pizza, Garfield shows the farm animals how to live life his way.

Garfield is rejected from The Pet Show because he's too fat to enter, so Odie takes his place and competes against Nermal for lasagna.

Garfield and Odie get taken to another land through a magic mirror where Neferkitty (voiced by Susan Silo) and her Egyptian colony of cats live, planning their revenge on humans.

Garfield and Odie are mistakenly accused of stealing barbecued ribs (really stolen by neighborhood pets) when they run away from Jon's twin girl cousins.

Garfield and Odie discover talking fish in the sea.

Jon tries to take the "perfect family picture" for Liz's birthday present but people always come and disturb everything.

When an Alien stops at a Super-Market in earth, Garfield mistakenly enters his Space Ship and travels through different planets but it becomes hard for him to survive. The space ship and the alien are very similar to Doc Brown and the Flying DeLorean Time Machine from Back to the Future.

When Jon reluctantly agrees to look after Liz's fish, Garfield can't resist eating them.

When Garfield, Jon, Odie, and Liz go on a picnic, Odie sneaks a baby wolf into the house and sends the Mom after Jon and Garfield.

Garfield gets sucked into a parallel universe where cats act like humans and humans act like cats where he meets the human-like Garfield.

Garfield is enrolled on the Dr. Whipple's Pet obedience course after Jon secretly tapes him misbehaving, but Garfield eventually discovers the doctor as a sham artist fraudulently using his course to launder money for himself; the doctor is then ruined when Garfield sneaks a microphone backstage as the Doctor says the public is stupid.

Jon and Doc Boy might inherit their cousin's haunted estate but to take custody must stay there longer than the other.

Jon is watching a cooking show to make Odie's birthday cake when Jon accidently switched the channel, leaving Jon to mistake the directions from the horror movie as being from the cooking show. It becomes a Frankenstein-like monster cake.

Odie runs away from home, sick of Garfield's cruelty towards him, but the new house he runs off to is the residence of a boy with the personality of a mad scientist named Nathan, who plans to use his new invention to transform Odie into a cockroach. Now it is up to Garfield to save Odie.

Garfield tries to take Squeak and his friends to Eddie Gormand's Cheeseland, but Harry is in charge of keeping mice out.

Nermal steals Pooky after Garfield is mean to him, and Garfield must be nice to Nermal to get Pooky back.

Garfield imitates a superhero so that Nermal will reward him with food, but gets caught up with the real superhero and a bank robbery.

Garfield helps Oga, the ice cream lady, find a prehistoric mate.

Jon wins the lottery, but is unable to find his ticket.

An alien from a planet with no gravity lands on earth to recharge his ship. While in Jon's house he cancels out gravity, causing household object to float around the house. This is Nimbus's second appearance, though he's been redesigned and has a higher pitched voice.

Jon sneezes every time he is near Garfield, and his doctor explains that he must get rid of Garfield, however when Garfield does something nice for Jon, he uncovers a shocking secret: he is allergic to goldenrod.

Garfield has to lose ten pounds, but Jon discovers he has been snacking between meals. Liz gives him a robot that will follow Garfield everywhere he goes to endure he sticks to his diet, but Garfield tricks Jon

Squeak's cat-hating relative, Max, moves into Garfield's home and rallies the other mice to rebel against him. Meanwhile, Jon calls an exterminator to come rid his house of them. This is Max's first appearance.

Jon spends the day in a vacation house to come up with a comic book idea. The only trouble is, the house is haunted.

The twins, Dresilla and Minerva, come to visit, and end up like Hansel and Gretal in an evil witch's lair.

Jon is in debt, and decides he must sell some of his possessions to pay the bill. When Garfield puts Odie on the stall for two cents, he is bought by the person Jon is being sued by, and it is up to Garfield to get him back.

Jon, Garfield, and Odie visit Doc Boy on the farm. While there, Dr. Whipple hypnotizes Garfield into doing farm work.

Aliens from another planet plan to turn all the earth creatures into chickens. This is the first appearance of Vito's pizza boy.

One of the baby bluebirds from "Mother Garfield" return and Garfield saves him from Harry. But Nermal accidentally lets Harry have it and Garfield, Nermal, and Odie must save it.

After Eddie Gourmand gives a bad review about Vito's Pizzaria on TV, Jon, Garfield, and Odie go see him to find out why he's so cranky lately and help him reunite with his mother.

After eating dogfood, Garfield is convinced he's turning into a dog.

Aunt Ivy's house is being rid of mice and she has to stay at Jon's home for a week. Then, Drusilla and Minerva show up, and Jon is so annoyed with them that he tries to get them to stay at Doc Boy's farm. But Doc Boy doesn't want to put up with them either. This is Aunt Esther, Lucretia, and Tabitha's first appearance.

Nermal comes over for a visit and the space lasagna return once again and send a spy disguised as a cute kitten over to Garfield's home. The "kitten" is way cuter than Nermal, and Nermal gets jealous.

Jon goes out on a big date with Liz and orders Garfield a pizza for dinner from Vito's Pizzaria. Garfield uses a tape recorder to record Jon's ordering the pizza, and uses it to get free pizza and, also, to harass Vito.

After a failed microwave lasagna, Jon takes the pets to their favorite pizzeria. Vito waves their praise, claiming his mentor Giuseppe Cuistone makes the world's best lasagna but disappeared years ago. Through chattering mice, Garfield tracks him down and won't rest until he can taste the ultimate Italian delicacy. the results are striking for them, Vito and Jon.

Eddie Gourmand, a food critic, is fired from his show only to be replaced by his station manager who wants to promote a healthier way of cooking. After a chance meeting in a movie theater, Jon invites him back to his house for dinner. But when Eddie injures his foot because of Garfield, he has to stay at Jon’s and orders him to take care of him until he is healed or else he’ll sue.

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Odie gets captured by a giant squid in the sewer and Garfield attempts to rescue him

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Jon, Garfield, Odie, Drusilla and Minerva discover some strange weather when going camping

The mayor passes a law requiring everyone to be kind to cats.

Jon adopts a kitten who is more trouble than he's worth.

After a meteorite lands, it turns Odie into a prehistoric dog.

A group of inhabitants who live underground turn everbody into procrastinators.

Garfield solves a mystery of who stole a rare comic book.

Jon, Garfield, and Odie go in search of their friend Lyman.

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Nathan tests a out device that can control people's minds.

Mrs. Cauldron's niece wants to marry Jon.

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Nathan tests out a device that can make one invisible.

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